/**
*
*  MD5 (Message-Digest Algorithm)
*  http://www.webtoolkit.info/
*
**/




var MD5 = function (string) {




  function RotateLeft(lValue, iShiftBits) {


    return (lValue << iShiftBits) | (lValue >>> (32 - iShiftBits));


  }




  function AddUnsigned(lX, lY) {


    var lX4, lY4, lX8, lY8, lResult;


    lX8 = (lX & 0x80000000);


    lY8 = (lY & 0x80000000);


    lX4 = (lX & 0x40000000);


    lY4 = (lY & 0x40000000);


    lResult = (lX & 0x3FFFFFFF) + (lY & 0x3FFFFFFF);


    if (lX4 & lY4) {


      return (lResult ^ 0x80000000 ^ lX8 ^ lY8);


    }


    if (lX4 | lY4) {


      if (lResult & 0x40000000) {


        return (lResult ^ 0xC0000000 ^ lX8 ^ lY8);


      } else {


        return (lResult ^ 0x40000000 ^ lX8 ^ lY8);


      }


    } else {


      return (lResult ^ lX8 ^ lY8);


    }


  }




  function F(x, y, z) { return (x & y) | ((~x) & z); }


  function G(x, y, z) { return (x & z) | (y & (~z)); }


  function H(x, y, z) { return (x ^ y ^ z); }


  function I(x, y, z) { return (y ^ (x | (~z))); }




  function FF(a, b, c, d, x, s, ac) {


    a = AddUnsigned(a, AddUnsigned(AddUnsigned(F(b, c, d), x), ac));


    return AddUnsigned(RotateLeft(a, s), b);


  };




  function GG(a, b, c, d, x, s, ac) {


    a = AddUnsigned(a, AddUnsigned(AddUnsigned(G(b, c, d), x), ac));


    return AddUnsigned(RotateLeft(a, s), b);


  };




  function HH(a, b, c, d, x, s, ac) {


    a = AddUnsigned(a, AddUnsigned(AddUnsigned(H(b, c, d), x), ac));


    return AddUnsigned(RotateLeft(a, s), b);


  };




  function II(a, b, c, d, x, s, ac) {


    a = AddUnsigned(a, AddUnsigned(AddUnsigned(I(b, c, d), x), ac));


    return AddUnsigned(RotateLeft(a, s), b);


  };




  function ConvertToWordArray(string) {


    var lWordCount;


    var lMessageLength = string.length;


    var lNumberOfWords_temp1 = lMessageLength + 8;


    var lNumberOfWords_temp2 = (lNumberOfWords_temp1 - (lNumberOfWords_temp1 % 64)) / 64;


    var lNumberOfWords = (lNumberOfWords_temp2 + 1) * 16;


    var lWordArray = Array(lNumberOfWords - 1);


    var lBytePosition = 0;


    var lByteCount = 0;


    while (lByteCount < lMessageLength) {


      lWordCount = (lByteCount - (lByteCount % 4)) / 4;


      lBytePosition = (lByteCount % 4) * 8;


      lWordArray[lWordCount] = (lWordArray[lWordCount] | (string.charCodeAt(lByteCount) << lBytePosition));


      lByteCount++;


    }


    lWordCount = (lByteCount - (lByteCount % 4)) / 4;


    lBytePosition = (lByteCount % 4) * 8;


    lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80 << lBytePosition);


    lWordArray[lNumberOfWords - 2] = lMessageLength << 3;


    lWordArray[lNumberOfWords - 1] = lMessageLength >>> 29;


    return lWordArray;


  };




  function WordToHex(lValue) {


    var WordToHexValue = "", WordToHexValue_temp = "", lByte, lCount;


    for (lCount = 0; lCount <= 3; lCount++) {


      lByte = (lValue >>> (lCount * 8)) & 255;


      WordToHexValue_temp = "0" + lByte.toString(16);


      WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length - 2, 2);


    }


    return WordToHexValue;


  };




  function Utf8Encode(string) {


    string = string.replace(/\r\n/g, "\n");


    var utftext = "";




    for (var n = 0; n < string.length; n++) {




      var c = string.charCodeAt(n);




      if (c < 128) {


        utftext += String.fromCharCode(c);


      }


      else if ((c > 127) && (c < 2048)) {


        utftext += String.fromCharCode((c >> 6) | 192);


        utftext += String.fromCharCode((c & 63) | 128);


      }


      else {


        utftext += String.fromCharCode((c >> 12) | 224);


        utftext += String.fromCharCode(((c >> 6) & 63) | 128);


        utftext += String.fromCharCode((c & 63) | 128);


      }




    }




    return utftext;


  };




  var x = Array();


  var k, AA, BB, CC, DD, a, b, c, d;


  var S11 = 7, S12 = 12, S13 = 17, S14 = 22;


  var S21 = 5, S22 = 9, S23 = 14, S24 = 20;


  var S31 = 4, S32 = 11, S33 = 16, S34 = 23;


  var S41 = 6, S42 = 10, S43 = 15, S44 = 21;




  string = Utf8Encode(string);




  x = ConvertToWordArray(string);




  a = 0x67452301; b = 0xEFCDAB89; c = 0x98BADCFE; d = 0x10325476;




  for (k = 0; k < x.length; k += 16) {


    AA = a; BB = b; CC = c; DD = d;


    a = FF(a, b, c, d, x[k + 0], S11, 0xD76AA478);


    d = FF(d, a, b, c, x[k + 1], S12, 0xE8C7B756);


    c = FF(c, d, a, b, x[k + 2], S13, 0x242070DB);


    b = FF(b, c, d, a, x[k + 3], S14, 0xC1BDCEEE);


    a = FF(a, b, c, d, x[k + 4], S11, 0xF57C0FAF);


    d = FF(d, a, b, c, x[k + 5], S12, 0x4787C62A);


    c = FF(c, d, a, b, x[k + 6], S13, 0xA8304613);


    b = FF(b, c, d, a, x[k + 7], S14, 0xFD469501);


    a = FF(a, b, c, d, x[k + 8], S11, 0x698098D8);


    d = FF(d, a, b, c, x[k + 9], S12, 0x8B44F7AF);


    c = FF(c, d, a, b, x[k + 10], S13, 0xFFFF5BB1);


    b = FF(b, c, d, a, x[k + 11], S14, 0x895CD7BE);


    a = FF(a, b, c, d, x[k + 12], S11, 0x6B901122);


    d = FF(d, a, b, c, x[k + 13], S12, 0xFD987193);


    c = FF(c, d, a, b, x[k + 14], S13, 0xA679438E);


    b = FF(b, c, d, a, x[k + 15], S14, 0x49B40821);


    a = GG(a, b, c, d, x[k + 1], S21, 0xF61E2562);


    d = GG(d, a, b, c, x[k + 6], S22, 0xC040B340);


    c = GG(c, d, a, b, x[k + 11], S23, 0x265E5A51);


    b = GG(b, c, d, a, x[k + 0], S24, 0xE9B6C7AA);


    a = GG(a, b, c, d, x[k + 5], S21, 0xD62F105D);


    d = GG(d, a, b, c, x[k + 10], S22, 0x2441453);


    c = GG(c, d, a, b, x[k + 15], S23, 0xD8A1E681);


    b = GG(b, c, d, a, x[k + 4], S24, 0xE7D3FBC8);


    a = GG(a, b, c, d, x[k + 9], S21, 0x21E1CDE6);


    d = GG(d, a, b, c, x[k + 14], S22, 0xC33707D6);


    c = GG(c, d, a, b, x[k + 3], S23, 0xF4D50D87);


    b = GG(b, c, d, a, x[k + 8], S24, 0x455A14ED);


    a = GG(a, b, c, d, x[k + 13], S21, 0xA9E3E905);


    d = GG(d, a, b, c, x[k + 2], S22, 0xFCEFA3F8);


    c = GG(c, d, a, b, x[k + 7], S23, 0x676F02D9);


    b = GG(b, c, d, a, x[k + 12], S24, 0x8D2A4C8A);


    a = HH(a, b, c, d, x[k + 5], S31, 0xFFFA3942);


    d = HH(d, a, b, c, x[k + 8], S32, 0x8771F681);


    c = HH(c, d, a, b, x[k + 11], S33, 0x6D9D6122);


    b = HH(b, c, d, a, x[k + 14], S34, 0xFDE5380C);


    a = HH(a, b, c, d, x[k + 1], S31, 0xA4BEEA44);


    d = HH(d, a, b, c, x[k + 4], S32, 0x4BDECFA9);


    c = HH(c, d, a, b, x[k + 7], S33, 0xF6BB4B60);


    b = HH(b, c, d, a, x[k + 10], S34, 0xBEBFBC70);


    a = HH(a, b, c, d, x[k + 13], S31, 0x289B7EC6);


    d = HH(d, a, b, c, x[k + 0], S32, 0xEAA127FA);


    c = HH(c, d, a, b, x[k + 3], S33, 0xD4EF3085);


    b = HH(b, c, d, a, x[k + 6], S34, 0x4881D05);


    a = HH(a, b, c, d, x[k + 9], S31, 0xD9D4D039);


    d = HH(d, a, b, c, x[k + 12], S32, 0xE6DB99E5);


    c = HH(c, d, a, b, x[k + 15], S33, 0x1FA27CF8);


    b = HH(b, c, d, a, x[k + 2], S34, 0xC4AC5665);


    a = II(a, b, c, d, x[k + 0], S41, 0xF4292244);


    d = II(d, a, b, c, x[k + 7], S42, 0x432AFF97);


    c = II(c, d, a, b, x[k + 14], S43, 0xAB9423A7);


    b = II(b, c, d, a, x[k + 5], S44, 0xFC93A039);


    a = II(a, b, c, d, x[k + 12], S41, 0x655B59C3);


    d = II(d, a, b, c, x[k + 3], S42, 0x8F0CCC92);


    c = II(c, d, a, b, x[k + 10], S43, 0xFFEFF47D);


    b = II(b, c, d, a, x[k + 1], S44, 0x85845DD1);


    a = II(a, b, c, d, x[k + 8], S41, 0x6FA87E4F);


    d = II(d, a, b, c, x[k + 15], S42, 0xFE2CE6E0);


    c = II(c, d, a, b, x[k + 6], S43, 0xA3014314);


    b = II(b, c, d, a, x[k + 13], S44, 0x4E0811A1);


    a = II(a, b, c, d, x[k + 4], S41, 0xF7537E82);


    d = II(d, a, b, c, x[k + 11], S42, 0xBD3AF235);


    c = II(c, d, a, b, x[k + 2], S43, 0x2AD7D2BB);


    b = II(b, c, d, a, x[k + 9], S44, 0xEB86D391);


    a = AddUnsigned(a, AA);


    b = AddUnsigned(b, BB);


    c = AddUnsigned(c, CC);


    d = AddUnsigned(d, DD);


  }




  var temp = WordToHex(a) + WordToHex(b) + WordToHex(c) + WordToHex(d);




  return temp.toLowerCase();

}

module.exports = {
  MD5,
  md5: MD5
}